PLA addition to high strength and modulus of the oute

PLA addition to high strength and modulus, but also has good biocompatibility and biodegradability, its degradation products can participate in the body's metabolism, and is available in a wide range of properties by copolymerization with other monomers is adjusted, Currently in the field of biodegradable medical materials most attention and application, can be used as medical sutures, drug delivery materials, bone fixation and repair materials. Since PLA glass transition temperature (Tg) above room temperature, so below Tg, PLA exhibit brittle glass-like, has a high tensile strength, Calcium lactate modulus, hard, but the toughness is poor, the lack of flexibility and elasticity ; above Tg, PLA showed a large elasticity, flexibility and impact strength. Furthermore, PLA chemical structure lacking a reactive functional group, nor a hydrophilic, need to control the degradation rate of the gas,magnessium lactate and other small molecules are poor blocking capability, these are restricting the PLA in the textile, plastic packaging and other areas Application. Especially as a packaging material, in addition to have a lower price, but also must have good flexibility and resistance to penetration. Therefore, the PLA must be modified to improve its performance, in order to expand the application range.